U1S8 Changes of States

Physical Science

What is thermal energy?

The part of total internal energy that can be transferred.

What is melting?

The process by which a solid becomes a liquid.

What is a physical change?

A change in one or more physical properties of a substance but not its identity.

What is kinetic energy?

The energy resulting from the motion of particles.

What is sublimation?

The process by which a solid becomes a gas.

During a change of state, does the substance change identity?

No, the substance does not change identity.

What changes during a change of state?

The arrangement of particles changes.

What are all substances made of?

Particles that are in constant motion.

What results from the motion of particles?

Kinetic energy.

What happens if energy is added to particles?

The particles move faster.

What happens if energy is removed from particles?

The particles move slower.

What happens to particle motion as temperature increases?

Particles move faster and have greater kinetic and thermal energy.

What is freezing?

The process by which a liquid becomes a solid.

What is vaporization?

The process by which a liquid becomes a gas.

What is condensation?

The process by which a gas becomes a liquid.

What is deposition?

The process by which a gas becomes a solid.

How is energy related to changes of state?

Energy must be added or removed to change the motion of particles and cause a change of state.